Error on recovery for SERVER-SEND

[agend]

While running DC recovery getting lots of errors like:

2017-02-02 07:56:47.358    140210179770176/28169 ERROR: Failed to server-send key: ffe23d0a84b6f803de06ff2ccf0fa30fa290150c88e8da4720136e01d046ecd9437d3567af5a3955670419cb82fa5f3a62de3dea0511eb1600000002383458c2, group_id: 1, error: -2, attrs: ['thread': 'MainThread', process': 'MainProcess']

And now recovery sends them via one-by-one write operations with success.